<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!--警告区域-->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数!"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!--商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!--选择商品分类的級聯選擇框-->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!--tab頁籤區域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加動態參數的面板-->
        <el-tab-pane label="动态参数" name="many">
          <!--添加動態參數的按鈕-->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!--動態參數表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展開行-->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!--循環渲染tag標籤-->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!--輸入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加按鈕-->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <!--添加静态属性的按鈕-->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展開行-->
             <el-table-column type="expand">
              <template v-slot="scope">
                <!--循環渲染tag標籤-->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!--輸入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加按鈕-->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加參數的對話框-->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!--添加參數的對話框-->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--修改參數的對話框-->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!--修改參數的對話框-->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分類列表
      catelist: [],
      //級聯選擇框的配置對象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //級聯選擇框雙向綁定到的數組
      selectedCateKeys: [],
      //被激活的頁籤的名稱
      activeName: 'many',
      //動態參數的數據
      manyTableData: [],
      //靜態屬性的數據
      onlyTableData: [],
      //控制添加對話框的顯示與隱藏
      addDialogVisible: false,
      //添加參數的表單數據對象
      addForm: {
        attr_name: '',
      },
      //添加表單驗證規則對象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      //控制修改對話框的顯示與隱藏
      editDialogVisible: false,
      //修改的表單數據對象
      editForm: {},
      //修改表單驗證規則對象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //獲取所有的商品分類列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    //級聯選擇框選中項會觸發這個函數
    handleChange() {
      this.getParamsDate()
    },
    //tab頁籤點擊事件的處理函數
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsDate()
    },
    //獲取參數列表的數據
    async getParamsDate() {
      //證明選中的不是三級分類
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //證明選中的是三級分類
      console.log(this.selectedCateKeys)
      //根據所選當前id和當前所處的面板,獲取對應的參數
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        //控制文本框的顯示與隱藏
        item.inputVisible = false
        //文本框輸入的值
        item.inputVisible = ''
      })

      console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //監聽添加對話框的關閉事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //點擊按鈕添加參數
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsDate()
      })
    },
    //點擊按鈕展示修改對話框
    async showEditDialog(attr_id) {
      //查詢當前參數的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //重置修改的表單
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //點擊按鈕修改參數信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功')
        this.getParamsDate()
        this.editDialogVisible = false
      })
    },
    //根據id刪除對應的參數項
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)
      //用戶取消了刪除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      //刪除的業務邏輯
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功')
      this.getParamsDate()
    },
    //文本框失去焦點會觸發
    async handleInputConfirm(row) {
      //檢視輸入是否為空
      if (row.inputVisible.length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果沒有return則證明輸入的內容需要做後續處理
      row.attr_vals.push(row.inputValue)
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    //點擊按鈕展示文本輸入框
    showInput(row) {
      row.inputVisible = true
      //讓文本框自動獲得焦點
      //$nextTick當頁面上元素被重新渲染後才會指定回調函數中的代碼
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //對attr_vals的操作保存到數據庫
    async saveAttrVals(row) {
      //需要發起請求保存此次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(','),
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    //刪除對應的參數可選項
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
  },
  computed: {
    //如果按鈕需要被禁用則返回true,否則false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //當前選中的三級分類的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //動態計算標題的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>